Malicious PDF — malware analysis report

Static analysis result for SHA-256 6757f052b3c5b460…

MALICIOUS

PDF

77.7 KB Created: 2021-02-22 10:46:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a4e7ce10aa5eec9310c93e77dc856918 SHA-1: 46a5a7015e3a4ede117bf8fbc1158720a69b71c9 SHA-256: 6757f052b3c5b4608c26a368fb679750412b3df40230250c10e5288463b47f4e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, which is designed to lure users into clicking on it. The embedded URL heuristic and the critical PDF_MALICIOUS_REDIRECTOR_LINK firing strongly indicate a phishing attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/wix?keyword=free+fortnite+accounts+ps4+discord In PDF document text
    • https://static.s123-cdn-static.com/uploads/4408992/normal_6006b38a76a43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_602863d641af0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481510/normal_5fffdee8ddc01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413578/normal_5fd7865174fc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449783/normal_5fe178c4b3940.pdfIn PDF document text
    • http://kolejuf.iblogger.org/swingline_gbc_letter_size_laminating_sheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zupenafud/78282989426.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/migavorubimu.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/frozen_shoulder_clinical_practice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/waganelikew.pdfIn PDF document text
    • http://lavofedelozus.rf.gd/55118088359.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/cameroon_visa_application_form.pdfIn PDF document text
    • http://luwawabegopit.rf.gd/is_the_crown_season_2_accurate.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/11641646396.pdfIn PDF document text
    • http://lamupilabixekuw.epizy.com/fujivetovufexelexajejorik.pdfIn PDF document text
    • http://lojuwuwa.rf.gd/sagif.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE08 6812 bytes
SHA-256: 2e0ee37cd64f4c35472631c058407906ad20f0781d2500579fe3f45af03c2431
font_01_sfnt_off0000cf3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3F 5160 bytes
SHA-256: dc7c09511072979bc900cd18e85d3787d9b234db99d7d7a4735e77b8789d6ee6
font_02_sfnt_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 4088 bytes
SHA-256: 6da4253c351d8bf691d46e3c721e225b69e412f20744ca7223b646f50aaffc13
font_03_sfnt_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 9800 bytes
SHA-256: 42cb8bca3d606a5e2c5785d07287891c0857c43cc34fe92bd11a4e430bed519d
font_04_sfnt_off000112d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D9 16344 bytes
SHA-256: fba96de501cef69d99198fa82bdf28b7a8f40a9939f4442b90447cc17cb37325

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